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Anticoagulant Drugs: Low-Molecular-Weight Heparins

Anticoagulant Drugs: Low-Molecular-Weight Heparins

Hemostasis is a crucial process that prevents excessive blood loss from damaged blood vessels. It involves various mechanisms such as vasoconstriction, platelet adhesion and activation, and fibrin formation. The importance of each mechanism depends on the type of vessel injury. In contrast, thrombosis is the abnormal formation of a blood clot within the blood vessels, leading to potential complications if the clot obstructs blood flow. Thrombosis can be caused by increased coagulability of the...

Extrinsic and Intrinsic Pathways of Hemostasis

Extrinsic and Intrinsic Pathways of Hemostasis

Blood clotting or coagulation involves extrinsic and intrinsic pathways, which ultimately merge into the common pathway, forming a fibrin clot.
The Extrinsic Pathway
The extrinsic pathway of coagulation is typically initiated by tissue damage that exposes blood to tissue factor (TF), a protein released by the damaged tissue cells outside the blood vessels—this interaction with TF triggers biochemical reactions involving specific clotting factors. The key player here is Factor VII, which...

Disorders of Hemostasis

Disorders of Hemostasis

Hemostasis, the process that stops bleeding after a blood vessel injury, is crucial for maintaining the integrity of the circulatory system. However, disorders of hemostasis can disrupt this delicate balance, leading to either excessive clotting or bleeding. These disorders can be broadly classified into thromboembolic disorders and bleeding disorders.
Thromboembolic Disorders
Two factors primarily cause thromboembolic conditions.

Coagulation

Coagulation

The coagulation phase is a critical part of the body's process to prevent blood loss following injury to blood vessels. It involves chemical reactions that form a clot to seal the injured area. The clotting process begins shortly after injury, within 15-20 seconds for severe damage and 1-2 minutes for minor injuries.
During the coagulation phase, clotting factors, or procoagulants, play a vital role in initiating and progressing the coagulation cascade. This cascade is a series of reactions...

Clot Retraction and Fibrinolysis

Clot Retraction and Fibrinolysis

After a fibrin clot is formed, the next step is clot retraction, a vital process facilitated by platelet contractile proteins, such as actin and myosin. These proteins pull the fibrin strands closer together and condense the clot. This action reduces the size of the clot, creating a smaller, denser structure that effectively seals off the damaged vessel. Clot retraction consolidates the clot and helps with wound healing by bringing the edges of the damaged blood vessel closer together.

Infertility in Females

Infertility in Females

Female infertility is defined as the inability to conceive after a year of regular, unprotected intercourse and affects about 10–15% of couples worldwide. The primary cause of female infertility is ovulatory disorders, which hinder the release of eggs. These disorders can be classified as hypothalamic amenorrhea, polycystic ovarian syndrome (PCOS), premature ovarian failure, and hyperprolactinemic anovulation disorders.
Endometriosis, a condition characterized by abnormal growth of...

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Related Experiment Video

Updated: Jun 22, 2025

Measurement of Factor V Activity in Human Plasma Using a Microplate Coagulation Assay

Measurement of Factor V Activity in Human Plasma Using a Microplate Coagulation Assay

Published on: September 9, 2012

Factor X deficiency and pregnancy.

Seema Chigateri¹, Apoorva Jain², Ajay Kumar Oli²

¹Obstetrics and Gynecology Department, SDM College of Medical Sciences and Hospital Shri Dharmasthala Manjunatheshwara University Sattur, Dharwad, Karnataka, India.

BMJ Case Reports

|July 3, 2024

Summary

This summary is machine-generated.

Factor X deficiency, a rare inherited bleeding disorder, poses risks during pregnancy. Effective management of this coagulation factor deficiency led to a successful pregnancy outcome.

Keywords:

Obstetrics and gynaecology Pregnancy

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Last Updated: Jun 22, 2025

Measurement of Factor V Activity in Human Plasma Using a Microplate Coagulation Assay

Measurement of Factor V Activity in Human Plasma Using a Microplate Coagulation Assay

Published on: September 9, 2012

Quantitating Iron Transport Across the Mouse Placenta In Vivo Using Nonradioactive Iron Isotopes

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Published on: May 10, 2022

Author Spotlight: Studying the Impact of Maternal Dietary Deficiencies on Long-Term Offspring Health Outcomes

Author Spotlight: Studying the Impact of Maternal Dietary Deficiencies on Long-Term Offspring Health Outcomes

Published on: June 28, 2024

Area of Science:

Hematology
Reproductive Medicine
Genetics

Background:

Factor X (FX) is a crucial vitamin K-dependent enzyme in the coagulation cascade.
Congenital Factor X deficiency is an autosomal recessive inherited disorder, often seen in consanguineous families.
Pregnancy in women with FX deficiency is linked to adverse fetal outcomes.

Observation:

This report details a case of pregnancy in a woman with congenital Factor X deficiency.
The patient underwent an emergency cesarean section at 38 weeks gestation due to severe oligohydramnios and fetal distress.
Management of Factor X deficiency during pregnancy was critical for a positive outcome.

Findings:

Effective management of Factor X deficiency during pregnancy is achievable.
Optimal utilization of available resources can lead to successful pregnancy outcomes despite FX deficiency.
This case highlights successful management strategies for FX deficiency in obstetric patients.

Implications:

This case demonstrates that with careful management, successful pregnancy outcomes are possible in women with Factor X deficiency.
It underscores the importance of multidisciplinary care and resource optimization for managing rare bleeding disorders during pregnancy.
Further research into optimal management protocols for Factor X deficiency in pregnancy is warranted.